William whiting



` UNTTED sTATEs PATENT oEEIcE.

i WM. WHITING, OF ROXBURY, AND HENRY PICKFORD, OF BOSTON, MASSACHUSETTS.

LOCK.

To all lwhom it may concern:

Be it known that we, WILLIAM WHITING, of Roxbury, in the county ofNorfolk and State of Massachusetts, and HENRY PICK- FORD, of Boston, inthe county of Suffolk and State aforesaid, have invented certain new anduseful Improvements in Burglar-Proof Bank-Locks, of which the followingis a full, clear, and exact description, reference being had to theaccom anying drawings, making part of this speci cation, in which-Figure 1 is a plan; Fig. 2, an elevation; Fig. 3, a vertical sectionupon the line A, A; Fig. 4, a vertical section on the line B, B, of Fig.1, the bolt in all these figures being shot and the key not yet removedfrom the lock. Fig. 5 is a similar section upon the line B, B, of Fig.l, the lock being unlocked and the key withdrawn. Fig. 6 is a plan ofthe key and Fig. 7 a section through the same upon the line C, C, ofFig. 6; Fig. 8, a view of the wrench shaft.

This look is 0f that class in which when the tumblers are arranged andthe lock is locked by a certain combination of the bits of the key, itcan only be unlocked by the combination employed to lock it.

To enable others skilled in the art to understand our invention we willproceed to describe the manner in which we have carried it out.

In the lock represented in the accompanying drawings D is the frontplate, through a suitable o ening F, in which the key is inserted. Thiskey E, Figs. 3, 6 and 7, is of a well known construction and isfurnished with ad'ustable bits a, which may be more or less elon atedfor the purpose of changing and multip ying the combinations. As the keyis entered in the lock (as in Fig. 3) the bits a, press upon the ins c,and raise the tumblers G, against t e action of their springs H.

The slides I, carry at their lower extremities hooks d, which enterslots f, in the tumblers, when these slides are forced back by theirsprings g. From these slides also project pins e, which enter the spacesin a grid m, when the slides are raised and forced forward. These slidesmove freely u and down in a frame or carriage K, which is forced forwardby the roller` p, upon anarm projecting from the wrench shaft. Whenrelieved from the pressure of this roller, the carriage and its slidesare forced back by the springs g, provided the tumblers are in positionto admit the hooks d', into the slots f.

L is the bolt which when shot is locked by the catch M. This catch ispivoted at h, and at its lower extremity embraces a pin projecting fromthe carriage K, and thus as the latter is thrown forward in the act oflocking the lock, the opposite end i, of the catch enters a notch in thebolt and a hole in the plate and holds the bolt from being withdrawn.

The wrench shaft N, seen detached in Fig. 8, carries the roller p, whichthrows forward the frame K, the bit q, for shooting the bolt, and a pinr, which raises the pawl O, out of the teeth x, of the tumblers G. Theroller p, which forces forward the slides I, and the pin r, are in suchrelative positions with respect to each other, that whenever the slidesare permitted to touch the tumblers, the pawl shall enter the teeth inthe tumblers and hold them stationary. It is evident were it not forthis connection of the slides with the pawl, that the lock could beeasily picked, as it would only be necessary to bring the slides to bearupon the tumblers, and raise the latter one by one until the hooks d,enter the slots j'. The slides would then be thrown back and the boltcould be withdrawn. With the above construction, if the wrench be turnedso as to raise the pawl from the teeth the slides will be thrown out ofcontact with the tumblers, and if the wrench be turned so as to bringthe slides in contact with the tumblers, the latter cannot be tamperedwith as they will be held by the pawl O.

That the lock may not be opened, or the parts strained by force appliedto the wrench the latter is connected with its shaft by a friction jointso arranged that when more force'is applied to the wrench than isrequired to unlock the lock, the wrench shall turn without its shaft,the wrench locking with a block P, which is held to the shaft by thepressure of the sprin z.

When the key E is pushe into the opening F, in the front plate D, it isretained by a stop S on the spring b. To take the key out, it is onlynecessary to press down on the end of the spring b. To prevent thecarriage K, from being thrown forward by turning the wrench shaft whenthe key E, is not in its place, the pins e, on the slides I, strikeagainst the lower part of the grid m,

when the slides are not raised by the tum- 2. Operating the slides, thebolt, and the 10 hlers. pawl O, directly from the Wrench shaft in WhatWe climLas ourlinvention and dethe manner substantially as herein setforth. sire to secure y etters atent, is-

1. The Combination 0f the Slides I, with VQIIIIIIQMHBQ- the paWl O7 soarranged that Whenever the slides are allowed to touch the tumblers, theWitnesses: v

awl shall engage the teeth of the tumblers P. E. TESCHEMACHER,

and hold them stationary. SAM. COOPER.

